Recent news reports indicate that an RFID
tracking chip capable of killing humans (that presumably
do not comply with rogue government demands) has already
been invented.

Beginning at 00:42, the YouTube clip contains
a segment on a "killer" RFID microchip that, upon
being remotely triggered, can send a lethal dose of
cyanide into a person's skin. The FOX News reporter
that introduces the segment can be heard saying that
the chip "will kill you if you get out of line." http://www.youtube.com/watch?v=yl2LMmwteCA